Setting Trim values

[mumf83]

How do you set trim values? Let's say for example, I have an electric plane and I want to quickly set my throttle trim (TrimT) value (say 50%) with a single click of the throttle up trim. The same goes for the down trim, a single click of the down trim will set the trim back to zero. I've seen other transmitters do this and is very handy.

Setting an offset via a GVAR and using a Special Function to set the values isn't working as it offsets the travel of the stick and full throttle is not at the very top so it gives you a strange response.

[jhsa]

Why would you need throttle trim on electric planes? Just curious..

João

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[mumf83]

Because I don't want the motor to stop when idling as when you are 3Ding the worst thing that can happen is the motor to stop and then the ESC takes a couple of seconds to start the motor back up again. You don't get that linear throttle response.

[Kilrah]

I usually use a switch instead of the trim keys. If you want the trim keys you can set up a Sticky logical switch that turns off/on with the trim keys. Use that to switch 2 input lines, mixer lines or override switch in a similar manner to a throttle cut.

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[mumf83]

I usually use a switch instead of the trim keys. If you want the trim keys you can set up a Sticky logical switch that turns off/on with the trim keys. Use that to switch 2 input lines, mixer lines or override switch in a similar manner to a throttle cut.

Envoyé de mon 16th en utilisant Tapatalk

I understand the sticky logical switch but I'm not following you on the second part regarding the input lines/mixer lines. Can you explain that bit again, please.

[Kilrah]

2 lines for throttle, one is normal and goes from -100 to +100, the other has weight/offset adjusted so as to raise the lower point a bit and is enabled when your switch is on.

[mumf83]

2 lines for throttle, one is normal and goes from -100 to +100, the other has weight/offset adjusted so as to raise the lower point a bit and is enabled when your switch is on.

By doing this you lose the full range of the stick movement. So as you move the stick to full throttle it reaches 100% before you get to the top, which doesn't make it linear anymore and feels very strange.

Here is what I tired:

[MikeB]

I'd do something like:
CH3: +100% Thr No Trim
R +100% Thr switch(SAv) [a replace mix]
and also select the "Throttle trim idle only" option.

With switch SA up, you get -100% to +100% throttle on the throttle stick.
With switch SA down, you get the throttle output set at the low end by the throttle trim setting, but at the high end the throttle trim has no effect and you get +100% at the point the throttle stick is fully advanced.

Mike

[mumf83]

I'd do something like:
CH3: +100% Thr No Trim
R +100% Thr switch(SAv) [a replace mix]
and also select the "Throttle trim idle only" option.

With switch SA up, you get -100% to +100% throttle on the throttle stick.
With switch SA down, you get the throttle output set at the low end by the throttle trim setting, but at the high end the throttle trim has no effect and you get +100% at the point the throttle stick is fully advanced.

Mike

Thanks Mike, this is the closest I've got so far. Once I know where the trim needs to be it will jump to the throttle trim setting when SA is down.

I wish I could just set the value of the trims. We can do a lot with trims except for setting the value of the trims . Does anyone know where we can ask for future features?

[Kilrah]

By doing this you lose the full range of the stick movement. So as you move the stick to full throttle it reaches 100% before you get to the top, which doesn't make it linear anymore and feels very strange.

Not if you adjust the weight accordingly as I said. On the radio there is a nice little live diagram that shows you the effective range you get.
Offset 5%, weight 95% gives you -90 to +100 with no deadband.

You could also use a curve if you prefer.

[thebriars0]

Because I don't want the motor to stop when idling as when you are 3Ding the worst thing that can happen is the motor to stop and then the ESC takes a couple of seconds to start the motor back up again. You don't get that linear throttle response.

Have you checked the settings on the ESC? Often you can set the ESC for a soft start, which does exactly as you have described. This may be the problem, and a much simpler solution therefore.

[bob195558]

Does anyone know where we can ask for future features ?

For the quickest new future features to be considered,
would be to use erSky9x firmware on your radio
and make your request to MikeB (9x Developer).
More erSky9x info found here for your radio: (http://www.er9x.com/).

[mumf83]

Not if you adjust the weight accordingly as I said. On the radio there is a nice little live diagram that shows you the effective range you get.
Offset 5%, weight 95% gives you -90 to +100 with no deadband.

You could also use a curve if you prefer.

If you've got the time can you send me a configuration like the screen shot I took above please. I must be doing something wrong as I can't get it to work and you seem very adamant this will work.

[mumf83]

For the quickest new future features to be considered,
would be to use erSky9x firmware on your radio
and make your request to MikeB (9x Developer).
More erSky9x info found here for your radio: (http://www.er9x.com/).

Thanks I'll take a look.

[mumf83]

Finally managed to get this working also with a smart throttle switch. See screen shot below for anyone else wanting this. Thank you for your help. I still hope we can just set the trim values in future though, will make it much easier.

[jhsa]

I still hope we can just set the trim values in future though, will make it much easier.

Why don't you use a pot to set the amount of trim??

João

[Kilrah]

He doesn't want trim at all... as a result the "set throttle idle only to 'true'" is useless.

[mumf83]

Why don't you use a pot to set the amount of trim??

João

Once I know where the offset needs to be I won't need to touch it ever again. So no need for a pot.

[mumf83]

He doesn't want trim at all... as a result the "set throttle idle only to 'true'" is useless.

true and I've edited my post to remove it, thanks.